Woody features can regulate the hydraulic properties of a landscape by influencing water flow paths during rainfall events and reducing runoff, and hedgerow planting is often included in modelling studies as a natural flood management solution. However, very little empirical evidence exists on the effect of hedgerows on soil hydrological properties, particularly when considering different soil groups. This study quantifies the soil physical and hydrological properties that may affect the flood risk mitigation potential of hedges, such as bulk density, porosity, saturated hydraulic conductivity, proportion of flow through different soil pore classes, and water-stable aggregates. We investigated 32 hedges of different age classes (new, 10 year old and old) in the River Eden catchment in north-west England, comparing them to adjacent predominantly grassland fields. We assessed how soil properties varied under hedges on two widespread reference soil groups and examined the orientation of hedges in respect to slope across the entire Eden catchment area. The soil group affected hydrological properties, but, overall, soil under hedges had a larger proportion of smaller soil pores and a better soil structure, with increased soil organic matter and larger soil aggregates, increased soil porosity and improved infiltration rates compared to grassland soils. Soil porosity under hedges was similar to 17% greater than in grasslands in both soil groups but remained significant at 0-30 cm depth on cambisols and at 0-50 cm only on stagnosols. Ksat under hedges was 52 times greater than in adjacent grass fields on cambisols and 45 times on stagnosols, and changes in Ksat under hedges on stagnosols occurred over a longer timeframe. Our results show that, in the catchment, hedge orientation of existing hedges is not associated with slope. Our results show that hedge planting has the potential to contribute to flood risk alleviation, but we found that the magnitude is larger and quicker on well-draining soils than on poorly draining soils. These results will aid future natural flood mitigation modelling.

This dataset contains survey data from 250 farmers located in Saxony (Germany), southern Moravia (Czech Republic), and England and their decisions on adopting agri-environmental schemes (AES). The online survey was conducted between September 2021 and April 2022 and included mostly closed-ended questions and a discrete choice experiment (DCE). The survey data covers farm characteristics, personal values and socio-demographic questions, as well as experiences with existing AES and factors influencing farmers’ participation in specific schemes. With the DCE, we collected preferences of farmers across case studies for a selection of contract characteristics. Respondents had to choose between four alternative AES and a “no scheme” option in which farmers would not receive any funding for agri-environmental practices. In addition to the offered payment level, contract length, bureaucratic effort and advisory support were key attributes that differed between the schemes.

Hedgerow planting is recommended by biodiversity policies and those that promote the inclusion of woody plants in agricultural landscapes to sequester atmospheric carbon into the soil. However, the extent and variability of soil organic carbon (SOC) sequestration under hedges are not known. We measured SOC stock beneath hedges in five pedoclimatic conditions in the UK to quantify the SOC sequestration potential associated with hedgerow planting. We measured SOC stocks in 10 cm intervals in the top 50 cm of soil or to bedrock, comparing 46 hedges of different age classes and their adjacent grassland fields. We assessed how additional SOC stocks and SOC sequestration rates under hedges varied with covariates of climate and soil properties. The mean additional SOC stock under hedges was consistent across pedoclimatic conditions at similar to 40 Mg C ha(-1) more than improved grassland fields. On average, SOC stocks beneath hedges were 40 % higher than in adjacent fields at 0-50 cm depth, with older hedges storing greater additional SOC stock at depth than younger hedges. The additional stock was driven by an increase in light particulate organic matter (l-POM), due to increased leaf and root litter inputs under woody vegetation. The mean SOC sequestration rate of mature hedges was 1.5 (1.0-2.0) Mg C ha(-1) yr(-1) while the net SOC sequestration rates over time since hedgerow planting declined from 4.2 to 0.2 Mg CO2 km(-1) yr(-1) within the first 20 years. Our results will aid future land-use related carbon accounting and inform climate change mitigation practice.

Hedgerows are a semi-natural habitat that supports farmland biodiversity by providing food, shelter, and habitat connectivity. Hedgerow planting goals have been set across many countries in Europe and agri-environment schemes (AES) play a key role in reaching these targets. Passive acoustic monitoring using automated vocalisation identification (automated PAM), offers a valuable opportunity to assess biodiversity changes following AES implementation using simple, community-level metrics, such as vocal activity of birds and bats. To evaluate whether vocal activity could be used to indicate the effectiveness of AES following hedgerow planting in future result-based or hybrid schemes, we surveyed twenty-four hedgerows in England classified into a chrono-sequence of three age categories (New, Young, Old). We recorded 4466 h over the course of 30 days and measured bird and bat vocal activity using BirdNET for birds and Kaleidoscope for bats. Vocal activity of all birds, farmland birds, and bats were modelled with age and predictors of hedgerow, habitat, and weather conditions to assess changes occurring from hedgerow planting to maturity. We show an increase of vocal activity in Young and Old hedgerows compared to New ones and highlight elements of the surrounding landscape that should be considered when evaluating AES implementation on bird and bat communities. We found high BirdNET precision in community-level vocal activity and low precision of species-level observations, and we argue that vocal activity may be used in novel AES to link a result-based payment component to automated PAM results, incentivising biodiversity effective hedgerow planting and management by farmers and landowners.

Abstract In Europe and elsewhere, agri‐environmental schemes (AES) are designed to reduce agriculture's impacts on the environment. Designing effective schemes requires an understanding of the reasons that drive farmers' decisions whether to adopt AES. Currently, most insights come from individual case studies or structured surveys based on predefined questions. There is a paucity of studies that do not rely on rigid preconceptions about relevant behavioural factors while also offering a geographically and socio‐culturally broad perspective that can address the cultural and institutional context‐specificity of behavioural studies. Also, most studies focus on the adoption decision, while implementation decisions and their consequences for the ecological effectiveness of AES remain understudied. In this article, we present the results from semi‐structured farmer interviews conducted in five agricultural landscapes across Europe. The results are used to uncover reasons for AES adoption as well as the implications of AES implementation decisions for their ecological effectiveness. The main reason for AES adoption that was common across case study regions is the interplay of opportunity costs and payment levels, which has negative implications for the ecological effectiveness of AES as farmers prioritized marginal land or adopted non‐additional AES. Among reasons that vary across regions, tenure relations and the role of ecological reasoning stand out. We find that AES are unlikely to trigger broader shifts towards sustainable management but there is some potential for improvement, mainly by increasing the flexibility, spatial targeting and ecological ambition of the schemes. Read the free Plain Language Summary for this article on the Journal blog.

Recent policy initiatives have placed a strong focus on the use of agricultural soils for atmospheric CO2 removal by adopting practices for sequestering and storing SOC. In the UK, changes in agricultural land use, such as the integration of woody species in the form of hedgerows--lines of regularly trimmed shrubs commonly used to delimit agricultural fields--, have been recommended for climate change mitigation. The Climate Change Committee has proposed a 40% increase in hedgerow length across the country as a key contribution to net-zero targets. In England, this would equate to 193,000 km of newly planted hedgerows. However, the contribution of hedgerow planting to reaching net-zero goals remains unclear due to a lack of data on the rate at which CO2 is taken up and stored in the soil beneath them. In our study, seventy-eight hedgerows across six different pedo-climatic conditions in England were classified into four age categories. Soil organic carbon (SOC) stocks were quantified at 10 cm intervals for the top 50 cm of soil beneath hedgerows and in adjacent grassland fields. Moreover, we examined the distribution of SOC among particle-size fractions to investigate how hedgerow planting may influence SOC dynamics by affecting the quality and long-term stability of organic matter in soils, particularly to illustrate why hedgerow-associated SOC stocks are rapidly lost after hedgerow removal. SOC stocks beneath hedgerows were higher than adjacent fields for all age categories and hedgerows stored an average additional 40% SOC stock in the top 50 cm of soil compared to adjacent fields and 30% in the top 30 cm of soil. The additional SOC stock beneath hedgerows was 40.9 Mg C ha-1 at 0-50 cm depth, or 6.1 Mg C km-1. We used a 37-year-old SOC sequestration rate to show that if England were to reach its goal of 40% increase in hedgerow length, 6.3 Tg of CO2 will be sequestered and stored in the soil over 40 years (9.9 Tg with aboveground biomass). However, it will take ~200 years to reach this target with current rates of planting in national public agri-environment schemes. These results contribute measurable outcomes towards the estimate of targets for net-zero 2050 and the extent of ecosystem services provision by hedgerow planting in agricultural landscapes.

Agroforestry practices, such as hedgerow planting, are widely encouraged for climate change mitigation and there is an urgent need to assess their contribution to national 'net-zero' targets. This study examined the impact that planting hedgerows at different rates could make to UK net-zero goals over the next 40 years, with a focus on 2050. We analysed the carbon (C) content of native hedgerow species and determined hedge aboveground biomass (AGB) C stock via de-structive sampling of hedges of known ages. AGB C stocks ranged from 8.34 Mg C ha-1 in the youngest hedges, to 40.42 Mg C ha-1 in old ones. Knowing the age of the hedgerows, we calculated their annual average AGB C sequestra-tion rate, which was highest in young hedges (2.09 Mg C ha-1 yr-1), and lowest in 39 year old mature, regularly trimmed hedgerows (0.86 Mg C ha-1 yr-1). We present a time series of the annual AGB C sequestration rate change between hedge age categories, which increases from 2.09 Mg C ha-1 yr-1 in the first 6 years after planting, to 2.26 Mg C ha-1 yr-1 in the next 6 years, and then decreases to 0.43 Mg C ha-1 yr-1 between years 13 and 40. Our results indicate that, if encouraged widely, hedgerow planting can be a valuable tool for atmospheric CO2 capture and storage, contributing towards net-zero targets. However, current planting rates (1778.8 km yr-1) are too low to reach the net-zero goal set by the UK Climate Change Committee of increasing hedgerow length by 40 % by 2050. An increased planting rate of 7148.1 km yr-1 will achieve this goal by 2050, and, over 40 years, store 3.41 Tg CO2 in hedge AGB, or 10.13 Tg CO2 in hedge total biomass and in the soil, annually offsetting 1.5 %-4.5 % of UK annual agricultural CO2 emissions.

This deliverable presents a Summaries of data, obstacles and challenges from interview campaigns of the H2020 BESTMAP project. It covers a detailed description of methodology, reporting on the concrete steps taken to collect and analyze interview data. It also discusses obstacles and challenges to BESTMAP interview campaigns. Finally, the deliverable presents the main qualitative and quantitative findings of the interview analysis, with a focus on qualitative content analysis of open interview questions.

Realising the carbon (C) sequestration capacity of agricultural soils is needed to reach Paris Climate Agreement goals; thus, quantifying hedgerow planting potential to offset anthropogenic CO2 emissions is crucial for accurate climate mitigation modelling. Although being a widespread habitat in England and throughout Europe, the potential of hedgerows to contribute to net-zero targets is unclear. This is the first study to quantify the soil organic carbon (SOC) sequestration rate associated with planting hedgerows. We derived SOC stocks beneath hedgerows based on two estimation methods to assess differences from adjacent intensively managed grassland fields and how these may be affected by sampling depth and hedgerow age, as well as the SOC estimation method used. Twenty-six hedgerows on five dairy farms in Cumbria, England, were classified based on the time since their planting. We measured SOC stocks in 10 cm depth intervals in the top 50 cm of soil beneath hedgerows and in adjacent grassland fields. SOC beneath hedgerows was on average 31.3% higher than in the fields, 3.3% for 2-4 year old hedgerows, 14.4% for 10 year old, 45.2% for 37 year old, and 57.2% for older ones. We show that SOC sequestration rate beneath 37 year old hedgerows was 1.48 Mg C ha-1 yr-1 in the top 50 cm of soil. If England reaches its goal of a 40% increase in hedgerow length, 6.3 Tg CO2 will be stored in the soil over 40 years, annually offsetting 4.7%-6.4% of present-day agricultural CO2 emissions. However, the current rate of planting funded by agri-environment schemes, which today reaches only 0.02% of emissions, is too slow. Private-sector payments for ecosystem services initiatives (e.g., 'Milk Plan') show much higher rates of planting and are needed alongside agri-environment schemes to ensure hedgerow planting contributes to net-zero targets.

The global recognition of modern agricultural practices’ impact on the environment has fuelled policy responses to ameliorate environmental degradation in agricultural landscapes. In the US and the EU, agri-environmental subsidies (AES) promote widespread adoption of sustainable practices by compensating farmers who voluntarily implement them on working farmland. Previous studies, however, have suggested limitations of their spatial targeting, with funds not allocated towards areas of the greatest environmental need. We analysed AES in the US and EU—specifically through the Environmental Quality Incentives Program (EQIP) and selected measures of the European Agricultural Fund for Rural Development (EAFRD)—to identify if AES are going where they are most needed to achieve environmental goals, using a set of environmental need indicators, socio-economic variables moderating allocation patterns, and contextual variables describing agricultural systems. Using linear mixed models and linear models we explored the associations among AES allocation and these predictors at different scales. We found that higher AES spending was associated with areas of low soil organic carbon and high greenhouse gas emissions both in the US and EU, and nitrogen surplus in the EU. More so than successes, however, clear mismatches of funding and environmental need emerged—AES allocation did not successfully target areas of highest water stress, biodiversity loss, soil erosion, and nutrient runoff. Socio-economic and agricultural context variables may explain some of these mismatches; we show that AES were allocated to areas with higher proportions of female producers in the EU but not in the US, where funds were directed towards areas with less tenant farmers. Moreover, we suggest that the potential for AES to remediate environmental issues may be curtailed by limited participation in intensive agricultural landscapes. These findings can help inform refinements to EQIP and EAFRD allocation mechanisms and identify opportunities for improving future targeting of AES spending.

Hedgerows can provide a wide range of regulatory ecosystem services within improved grassland landscapes, such as soil function improvement, soil erosion reduction, biodiversity, water quality, and flood prevention and mitigation. Because of their beneficial effects, farmers are incentivised to retain their hedgerows and the planting of hedges has been encouraged in agri-environment schemes in Europe. Today, hedgerow planting it is one of the most popular practices adopted in the Countryside and Environmental Stewardships in England. The role of hedgerows in climate change mitigation has been increasingly recognized over the past decade, however, while other services have been more widely studies, less is known about hedges soil organic carbon (SOC) storage capacity. The Resilient Dairy Landscapes project aims at identifying strategies to reconcile dairy systems productivity and environment in the face of climate change, and with the Committee on Climate Change calling for a 30% - 40% increase in hedgerow length by 2050 in the UK, it is important to determine the role of hedgerows in meeting Net Zero targets. In this study, we estimate the extent of SOC stock beneath hedges and how it may vary with depth, hedge management and age, as well as how it may compare to SOC stock in adjacent agricultural fields. Thus, we measured SOC under 2-4 years old, 10 years old, 37 years old, and 40+ years old hedgerows at 10 cm intervals up to 50 cm of depth under 32 hedges located on dairy farms in Cumbria, UK. We found that the time since planting and the depth of samples play a crucial role in the amount of SOC stock stored underneath hedgerows when accounting for differences in soil type. Our results contribute measurable outcomes towards the estimate of targets for Net Zero 2050 and the extent of ecosystem services provision by hedgerow planting in agricultural landscapes.

Conventional farming in the UK has had adverse effects on farmland biodiversity, particularly during post-war intensification of agriculture. Efforts have been made in the reversal of these effects, with much of the literature reporting a mixture of findings. At a localised scale, these efforts have been noticeable with RSPB Hope Farm observing a 200% increase in bird territory numbers from 2000 to 2012, achieved with the wide implementation of agri-environment schemes (AES) on the farm. We aimed to investigate the spatio-temporal drivers of territory density in four hedgerow specialist bird species using a thirteen year (2000–2012) dataset of hedgerow management, in-field cropping and field boundary habitat records. Territory maps were used to calculate territory counts for each hedgerow across the time period. Generalised Linear Mixed Models were used to model territory counts for each habitat variable. These findings demonstrate that for Emberiza citrinella, Carduelis cannabina and Sylvia communis, presence of oilseed rape (OSR) is a strong predictor of higher territory numbers, leading to a doubling in territory density compared to absence of OSR. However, tree presence in hedgerows was a negative predictor of territory numbers for these species. Opposing trends were observed for Carduelis chloris, which exhibited significantly greater territory numbers in roadside hedgerows, hedges with trees and when adjacent fields were not sown with a main crop. Management of hedges was a weak predictor of S. communis territories. This demonstrates that crop type, AES features, tree presence and location of hedgerows are drivers of farmland bird territory numbers. These findings validate the usefulness of more sustainable, wildlife-friendly farming under previous CAP rules and have important implications for post-Brexit farming policy, such as the Agriculture Bill.

Conventional arable systems are designed to produce food at high levels of efficiency, but usually require large amounts of energy and chemical inputs per unit of land, with cascading detrimental effects throughout the field agroecosystem. Thus, agricultural intensification processes have been linked with the decline of farmland bird and invertebrate populations, and with arable soil degradation. Today, agricultural policies and practices are seeking to develop arable systems that are less dependent on these inputs, and sustainable soil management (SSM) practices have been introduced as a way to maintain soil as a healthy living system and support agricultural production. This thesis aimed to assess if cover crop and green waste compost amendment have the potential to benefit farmland bird populations during breeding season. In particular, the thesis focused on the association of these practices with belowground and aboveground invertebrate abundance and assemblages, chick food availability, and Skylark Auleda arvensis territory settlement during breeding season. This study took place at Hope Farm, a commercial arable farm owned by the RSPB that has been operating since 2015 a trial of the effects of SSM in three experimental split-plot fields. Cover crops were shown to have a positive association with belowground invertebrate abundance and soil biological quality, and with the abundance of canopy dwelling invertebrates, suggesting that this practice may support invertebrate populations. Green compost, albeit strongly increasing soil organic carbon content, did not have an effect on invertebrates. Increased abundance of invertebrates was not reflected by an increase in in-field food availability to breeding birds, and the distribution of Skylark territories did not vary among plots with different soil treatment management over the course of five years. Thus, the results of this thesis suggest that cover crops and green compost did not benefit farmland birds at Hope Farm during summer. This thesis highlights the importance of evaluating the effects of individual in-field soil management practices expected to target broad environmental goals.

Urban food production is a growing area of interest as a way of increasing food security, social capital and biodiversity. As food production relies upon ecosystem services provided by invertebrates (e.g. decomposition), it is important to understand the underlying factors affecting their distribution. Here we investigated the influence of soil characteristics and patch area on the abundance and diversity of epigeal invertebrates. Seventeen sites of different size from in and around Leeds, UK, were selected from an open source database on urban food production. Pitfall traps were placed along transects to collect beetles, springtails, and spiders. These invertebrates were identified and counted, adjusting total counts for the number of traps used at each location. Soil samples from the trap locations were homogenized, dried, and analysed to measure organic carbon content, moisture content, and pH, while productivity was assessed by growing radish Raphanus sativus on the soils under uniform conditions. This study found no evidence of correlation of epigeal abundance and diversity with site area or soil characteristics. These findings suggest that there is no evidence as yet of urban food production sites that are too small to be able to draw upon ecosystem services delivered by epigeal invertebrates.

Biodiversity is declining at a global scale due to large and small scale processes associated with agricultural practices. Agriculture involves transforming natural habitats into systems designed to promote certain species for our consumption. The scale of this transformation is huge; it is estimated that 25 percent of potential net primary production is currently appropriated for human use, a figure that could nearly double by 2050. Inevitably, this appropriation reduces the amount of energy available for all other taxa, with inevitable consequences for biodiversity. These consequences are not uniform or random, however, because agricultural systems involve the reconfiguration of habitats and landscape elements, creating niches that allow some non-cropped species to survive, and even thrive in agricultural systems, depending on the traits they possess. Agricultural landscapes can be very biodiverse, and of high social and cultural value, especially where there has been continuity of management over long periods of time and the managed landscape presents natural habitat patches. The matrix of natural, semi-natural, and managed landscape plays a major role in supporting biodiversity by creating a complex spatial pattern of ecosystems and habitats. In many parts of the world this management continuity is under threat from land abandonment on the one hand and intensification on the other; both may cause biodiversity loss. However, it is being increasingly recognized that some non-cropped taxa perform valuable benefits to agricultural production, giving rise to the idea that agricultural landscapes may be redesigned to enhance such ecosystem services. The outcomes of such redesign may therefore still be biodiverse, but different to what is found now.

We assessed the effects of repeated hydropeaking over five consecutive days on the zoobenthic community by manipulating discharge in five experimental flumes directly fed by an Alpine stream. Treatment consisted of two different hydropeaking intensities which increased discharge two- and threefold from baseflow and lasted for 5h each day. The resulting sudden changes in flow directly affected benthic invertebrates through the induction of catastrophic drift as a direct response to high (hydropeaking) flow conditions, and of behavioural drift in the low, baseflow conditions (at the conclusion of each hydropeaking event) for some taxa. We observed: an initial strong peak in catastrophic drift within the first 3min of increased discharge, followed by a decreased drift rate throughout the following hours of the experiment; a strong response in the first day of the simulation, with successive days having substantially decreased drift; taxa-specific responses over the short and long-time scales: least-resistant taxa (i.e. Baetis spp.) were removed via the initial catastrophic drift, while more resistant taxa began to behaviourally drift later in each hydropeak (i.e. Simuliidae). Peaks in drift rates corresponded to the initial removal of CPOM which, during low flows, provided habitat and food resource for a high number of individuals and taxa. Quantification of drift responses over time scales larger than the single hydropeaking event underlines the relevance of the typical intermittency and repetition frequency as a stress factor for benthic communities, and that the response to hydropeaking is closely related to the time elapsed since the last perturbation. Copyright (c) 2015 John Wiley & Sons, Ltd.